bug(mat-calendar): The dateClass callback is not called then in month view.

[N-Andronopoulos]

Reproduction

Steps to reproduce:

1. Have a mat-calendar like:

              <mat-calendar
                [minDate]="today"
                [maxDate]="serviceMaxDate"
                [dateFilter]="filterDates"
                [dateClass]="classDates"
                [selected]="selectedDate"
                (selectedChange)="selectedDateChanges($event)">
              </mat-calendar>

2. Select -> years (on top) -> select a year -> then dateFilter is called (for all year dates) but the dateClass is not. So I don't get css classes on months cells.

Expected Behavior

I should be able to put css classes on month cells just like the days cells.

Actual Behavior

Only while in date view the dateClass callback is called for all month days.

Environment

• Angular: 9
• CDK/Material: 9.2.4,
• Browser(s): Chrome 83+
• Operating System: Windows 10

[jelbourn]

@N-Andronopoulos can you share a stackblitz that demonstrates this issue?

[crisbeto]

I think that this is working as expected. The name implies that it'll be called only on date cells, rather than month or year cells from the other views.

[N-Andronopoulos]

I think its logical to be used as I describe it since filterDates works in year view and there isn't an other way to put classes in year view. If it's implied that filterDates shouldn't work then and we should have a filterMonth/classMonth callbacks, but I think that's a waste of interface space. Year view (where you pick a month) should call classDates like it calls filterDates for all 365 days of the year.

[crisbeto]

That's fair. I think that we might need to pass in the name of the current view to the callback too, otherwise there won't be a way to distinguish the first date of a month from the cell representing that month.

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